please help me with all steps for the answer. thank you. What is voltage differe

Question

please help me with all steps for the answer. thank you.

What is voltage difference V_a - V_b? 15.0 V 5.0 V -1.7 V -3.0 V 2.4V What is the approximate amount of power dissipated in the 4.0 ohm resistor? Refer to the portion of a circuit below. What is the potential difference V_A - V_B if 1 = 5.0 A? Two copper wires have the same length, but wire 2 has 20% more area than wire 1. The ratio of the resistances of the two wires R_2/R_1 is The power dissipated in each of two resistors is the same. The current through resistor A is half of that through resistor B. If the resistance of resistor B is R. what is the resistance of A? A system of capacitors is connected across a 90 V DC voltage source as shown in the figure. What is the equivalent capacitance of this system? A system of capacitors is connected across a 90 V DC voltage source as shown in the figure. What is the charge on the 6 mu F capacitor? 180 mu C 6.0 mu C 54 mu C 18 mu C 540 mu C

Explanation / Answer

8)

vA - 8 - 5*10 + 13 = vB

vA - VB = 45 V

(9)

resistance R = rho*L/A

rho = resistivity

L = length

A = area of cross section

L2 = L1

rho2 = rho1

A2 = A1 + 0.2A1 = 1.2A1

R2/R1 = A1/A2 = 1/1.2 = 0.83 <<<--------answer

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10)

PA = PB

IA^2*RA = IB^2*RB

given IA = IB/2

RB = R

IB^2/4*RA = IB^2*R

RA = 4R <<---answer

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11)

2 & 4 are in series

C1 = (2*4)/(2+4) = 4/3 uF

3uF & 6 uF are in sereis

C2 = (3*6)/(3+6) = 2 uF

C1 & C2 are in parallel

Ceq = c1 + c2 = 3.3 uF   <<<<<<<<-------answer

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